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Technically, siblings work vertically within two degrees of seperation - up to your parents, and then down to their other children.

Even though I understand the "logic" behind that, I have to say that it's ridiculous. 1) You have an equal chance of sharing a given gene with both your parents and your siblings: 50% (and you have an equal chance of sharing a given gene with both your aunt and grandparents: 25%). 2) You spend, approximately, the same portion of your life building relationships with your parents and siblings, and these relationships are of similar magnitude in life.

Even though I understand the "logic" behind that, I have to say that it's ridiculous. 1) You have an equal chance of sharing a given gene with both your parents and your siblings: 50% (and you have an equal chance of sharing a given gene with both your aunt and grandparents: 25%). 2) You spend, approximately, the same portion of your life building relationships with your parents and siblings, and these relationships are of similar magnitude in life.

Objection, its not about genes in the first place.
Akazawa's brother was, in reality, her cousin yet died because of the phenomenon.
The manga does btw state that blood relation is not necessary, so even a stepbrother/sister would fall into the range of possible targets.

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Those who forget about the past are condemned to repeat it - Santayana

Sidenote: I'm seemingly too dumb for my current keyboard, so if you see the same character twice in a row, when it doesn't belong there just ignore it.Twitch

Objection, its not about genes in the first place.
Akazawa's brother was, in reality, her cousin yet died because of the phenomenon.
The manga does btw state that blood relation is not necessary, so even a stepbrother/sister would fall into the range of possible targets.

Akazawa's cousin was in the class, so him dying is completely unrelated to his true relationship with Akazawa.

I don't know about the manga, but the anime stated the opposite: the phenomenon does not target non-blood related family members.